Display screen or portion thereof with a graphical user interface



The single FIGURE is a front view of a display screen or portion thereofwith a graphical user interface showing our new design.

The grayscale shading within the solid line rectangular shapes indicatescontrasts in appearance. The outermost broken line showing the displayscreen or portion thereof and all other broken lines showing portions ofthe graphical user interface are included for the purpose ofillustrating portions of the article and form no part of the claimeddesign.

CLAIM We claim the ornamental design for a display screen or portionthereof with a graphical user interface, as shown and described.